Although the OP has logged on over the past day and a half, he has yet to reply to any of the above questions or comments. For example, was the transmission discussed the tractor's or the snow blower's?
So, in the end, I'm guessing this post was mostly about venting. OK. That's been done here before. But if this post was to attempt to leverage your dealer or Kubota to take action on your machine, you might do better dealing directly with them.
In 1981, I bought a brand new Ford F-150. It came with the 300 six cylinder, which everyone knows and history shows to be, flat out, one of the greatest engines ever built. Torque that could pull stumps and 21 mpg. Mind you, in a truck, in 1981.
Anyway, this was long before what we call lemon laws, but I had to take it back 3 or 4 times in the first month. It was pure junk. Yes, it happens. The engine, the trans, everything. I never did get more than 200 miles on it. In short? I finally just went into the sales manager's ofice, sat down, and firmly said, "It ends right here." He agreed and prepped another identical F-150. I had to eat the sales tax, because there was no redress for the governor's share. But away I drove in another one.
In short? That other F-150 was to become simply the best vehicle I ever, ever owned. Flat out. I still miss it. I hardly even remember the first one.
Frankly, sir, if I was in your shoes, I would take that approach to this deal. But, if you just want your money back in buyer's remorse, I wouldn't hold my breath.
Sincerely hope it all works out for you.